Telephone hand set



Jam 14, 1930. R. F. sTEHLIK TELEPHONE HANDSET Filed March 30. 1928 Patented Jan. 14, 1930 UNITED STATES PATEN RUDOLPH FRANK STEI-ILIK, 0F CHICAGO, ILLINOIS, ASSIGNOR TO RESERVE HOLDING COMPANY, OF KANSAS CITY, MISSOURI, A CORPORATION 0F DELAWARE TELEPHONE HANDl snr Application led 'March 30, 1928, Serial N'o.

The present invention relates to improvements in or relating to handset combinations as used in telephone instruments. Such handsets comprise, as is well known, a handle having a receiver at one. end and a transmitter supported at the other end, so arranged that when the receiver is brought to the ear the transmitter comes in front of the mouth.

The obje-ct ofthe present invention is a handset construction in which simplicity and cheapness of manufacture are combined with great durability, and the principal feature of the invention is that both the earcap and the transmitter cap are screwed directly on to the receiver and transmitter casings respectively, which casings are moulded in a single moulding including the handle betweenthe casings.

In one form of handset it has been usual to provide a separate horn or mouthpiece secured to or by the transmitter capl having an opening which must be arranged specially to come opposite the mouth of the user.

Further features of the invention concern the particular shape of the receiver handle,

important, as it and a novel mouthpiece, which is capable of receiving sound in a lateral direction irre` spective of the direction in which the sound may come. This latter feature is particularly is by this means a mouthpiece separate from the cap may be avoided, so that the two components can be made in a single piece, thereby considerably economiaing in the cost of manufacture.

These and other features of the invention will be better understood by referring to the accompanying drawings, in which Fig. 1 shows asection through a handset with receiver and transmitter casings. The receiver and transmitter, which are constructed in the form of capsules, are omitted for the sake of clearness. Fig. 2 shows a front view of the novel handset, while Fig. 3 shows a side view with the ear cap and mouthpiece cap omitted. Fig. 4 shows an enlarged section on the line A-B of Fig. 1, while Fig. 5 shows a similar enlarged section on the line C-D of Fig. 1.

Referring to Fig. 1, it will be noted that the handset comprises a single moulding,

includ- 265,989, and in Belgium December 20, 1927.

ing a handle portion 10, a receiver casing 11 and a transmitter casing 12. The moulding incorporates a brass or other metallic tube 13 extending from the receiver casing 11 to the transmitter casing 12 and serving to reinforce the handle, at the same timeproviding an opening through which conductors from the receiver may extend to the transmitter casing 12, and so through the opening 14a therein to the bell-box, together with the cords from the transmitter. The shape of this handset is novel, in that both the receiver casing 11 and the transmitter casing 12 have their axes somewhat out of the normal with respect to the straight portion 14 of the handle portion 10. This arrangement, together withfthe curved shape ofthe portion of the handle opposite to the straight portion 1&1, produces a rather novel shape, which is pleasing to the eye, and at the same time is particularly convenient for use. A further advantage is that the eccentric position of the brass tube in the centre ofthe handle increases the strength of the handle to a greater degree than if it was central. As regards manufacture it is advantageous, in that it enables the receiver cap 15 and the transmitter cap 16 to be screwed directly on to the casings 11 and 12 respectively. In certain constructions it has been necessary to design thereceiver cap so as to have a raised portion VVat the end furthest from the transmitter so as to give an appropriate angle to the handle. This is necessary where the receiver casing is normal or substantially normal to the straight side 14 of the transmitter handle. With the present inclination, however', the

receiver cap can be uniform all around, and

usually between the transmitter casing and p therefore, is theconstruction of a transmitter cap, which, while having openings admitting the receiver cap, the sound waves from the user pass in a lateral direction across the transmitter, and for this reason the caps have hitherto been provided with a mouthpiece having an opening solely in the direction of the mouth, thus necessitating that the mouthpiece must be definitely aligned with respect to the handset, and consequently an expensive adjusting means had to be provided to insure this'result. An important feature of the present invention in this connection,

sounds from all lateral directions, is yet eilicient in directing the sound waves generated by the user on to the diaphragm of the microphone. One form of carrying this into effect is shown in the accompanying drawings, the transmitter cap 16 being formed of a single stamping having a shape which may be said to resemble a hemisphere or spherical segment with the yupper portionV dented inwards so as to be substantially conical. This shape will be recognized in the section in Fig. 1 where the hemispherical portion is indicated by the reference 17, while the conical portion Vis indicated by the reference 18.V In the hemispherical portion '17 is a series of holes 19 (Which are better seen in Fig. 2) which extend all round the hemispherical portion of the cap at equal distances apart. Of

course, when the cap is screwed into position it is impossible to determine in advance exactly where the cap will rest, but it will be appreciated that with a capas constructed according to the present invention, in whatever position it comes to rest there will be Vopenings 19 facing-the mouth of the user.

lscribed is not the only shape possible.

Furthermore, the conical member 18 will serve Vto deflect the sounds coming from the 'user towards the diaphragm, and thus insure that the microphone is actuated by a sufiici'ent volume of sound waves as toV ensure efficient and satisfactory transmission.

. It should benoted that the exact shape de- An alternative construction, for instance, could comprise-a series of quarter-spheres, which were hollow, had their fiat sides projecting towards the outer ring of the cap and were pressed out from a flatmetal blank. This would serve a similar purpose 'of offering a means of collecting'sound froml the mouth o' ythe user and directing it on to the trans- Vm'itter cap. The exact shape of the handset, which is preferred to' other shapes, will be better understood by referring to Fig. 3 and Figs. t and from which it will be noted that the section of the handle is circular throughoutV its length and tapers Vgradually from the centre to the ends, where the receiver and transmitter casings are joined to it. The tube, it will be noted from Fig'yl, is

parallel to the straight side, and the curvature of the outer side of the handle conforms 2. In a transmitter mouthpiece or cap, a K

single stamping having a convex surface at its outer edge with openings therein spaced regularly all around the circumferences and a convex central surface serving'to reiiect sound waves receivedV through said `openings Vinwards to the transmitter.

3. A transmitter mouthpiece comprising aV circular outer convex portion, a plurality of openings arranged around the circumference of said portion, and another convex portion vformed inside said first convex portion` for receiving sound waves impinged thereon from said openings and for directing them at an angle onto the transmitter.

4. A transmitter mouthpiece comprising a single circular convex shaped vunit'with a plurality of .openings spaced regularly around the circumference thereof, anda conical convex portion formed in the centerof said unit and projecting opposite said openings so as to direct sound waves received through rsaid openings directly onto the transmitter.

5. A transmitter mouthpiece comprising a circular convex shaped unit with ac plu'rality of openings spaced around the circumference thereof, a conical convex portion formed'in the center Yof said unit and projecting ropposite said openings so that soundwaves are received through said openings and diverted by said conical portion to the transmitter unit, and means for supporting saidmouthpiece unit on said transmitter unit in such a manner that irrespective of the position to w 

